unusable within a work/production context
I wouldn't handle large data sets in production code. This is primarily for one-time hacks, but I wondered what other people would prefer.
No maintenance programmer is going to get confused years after ive left the company.
Note that if code like this ever goes into production, I do of course add proper comments, including a note that you shouldn't use @$r elsewhere (re your other post).
- firstname.lastname@example.org (do not use).